Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc3ac775edae6d0d…

MALICIOUS

PDF

98.6 KB Created: 2021-09-14 06:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7c832ce8c55bd5c0f0cc16773dbdfdb0 SHA-1: 0ed82f8cadcd67746a6ce6f8b6da727f6564a3ac SHA-256: bc3ac775edae6d0dba9bfe59dbb035f901e96a9e898733f6782bf6976819b38f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF document that utilizes embedded JavaScript, a common technique for executing malicious actions. It also features a large number of external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smidgel.ru/uplcv?utm_term=angry+birds+classic+game PDF link annotation
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613b706c4fcc0---67554207308.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/sirabeveka.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/9612473516.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/75719878188.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/83897639768.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/64c4e1899670181773cc7d866220c5c2/wasosu.pdfIn PDF document text
    • http://888chji.com/userfiles/files/xuniwinikedumexizomepe.pdfIn PDF document text
    • http://chineseclothingonline.net/File/roxozedenawesukukuna.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/ramegugidiwaviler.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.com/userfiles/file/sasuba.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/11131227466.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/48751433085.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/48398258820.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131bf5013647---14316792210.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/fanadakeka.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/65877311407.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210902045829.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/narux.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/jorokivazojomok.pdfIn PDF document text
    • http://space-edge.com/upload/files/kofuvidagaruxafeli.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161337872ae7fa---nizomezubuxibifuzapesiler.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/tixonatidezi.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/bimogabunesiresit.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/dinidejeguwitoseve.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/lorexilewutituvovufobab.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC5 20312 bytes
SHA-256: ca27e07284f7ab60d47e2d74570f7c407f486c522ef9781a2bc6e14e973bd0e7
font_02_sfnt_off00016475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16475 10732 bytes
SHA-256: bd8482e3abc3dadca385ab60889fd17e911e0db74f23965e2f301d6e35d41275

Open this report in the interactive analyzer, or submit your own file for analysis.